Green budgie with yellow head, lost near Yale

Hey, I’m posting because my green budgie with a bright yellow head flew away yesterday around 3:15pm. I last saw him on the Yale campus, near the Beinecke Library, and he slipped toward Whitney Avenue by the New Haven Green. He’s a small bird, about 6 inches tall, green with a yellow head, and he wears a blue plastic leg band with the number '12' and a white neck ring. He’s really attached to our family and his chirping lights up the apartment; he was a gift and has sentimental value. If anyone spots him, please text me and I’ll meet you there or wherever is convenient.